This says positive earth?

Post by **SvMinor** » Tue Dec 22, 2009 8:49 pm

This clock says pos earth would it still work on a neg earth car also?http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... ink:top:en

Post by **aupickup** » Tue Dec 22, 2009 8:52 pm

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... ink:top:en

linearaudio · Post by **linearaudio** » Tue Dec 22, 2009 9:34 pm

Only if you mounted on something isolated from the metalwork of the car, then connected that yellow wire to earth, and the case stud to +12V.
Wouldn't easily fit in the dash anyway as it has the time setting twiddler hanging out of the bottom, so would be easier to mount on an (insulated) bracket. Nice looking period beast though!

Post by **bmcecosse** » Tue Dec 22, 2009 10:03 pm

But look at the crazy price! The slightest short to the body of the car would ruin it - and blow a fuse. Just use your wrist watch!

Post by **SvMinor** » Tue Dec 22, 2009 11:25 pm

Thanks for the link au,I saw that 1 too

Post by **Kevin** » Wed Dec 23, 2009 10:05 am

Just a thought but if you already had one fitted that had been there for some time and then did a neg earth conversion to fit an alternator would the clock just stop working (you can tell this is my area of expertise

)

Post by **PSL184** » Wed Dec 23, 2009 10:09 am

It would depend on the individual clock you had Kevin. There are so many different types out there from over the years - the way the clock was wired up would need to be checked for the correct polarity.

Post by **bmcecosse** » Wed Dec 23, 2009 10:17 am

Maybe it would go backwards - be like Dr Who ?

Post by **Kevin** » Wed Dec 23, 2009 11:09 am

PSL184 wrote:It would depend on the individual clock you had Kevin. There are so many different types out there from over the years - the way the clock was wired up would need to be checked for the correct polarity.

All I was wondering is how often has a car's polarity been changed when it already had an existing clock and how it would affect the clock as it would have to originally been pos earth, some series MM's for example.

Dont think it would be a problem if you had access to a sonic screwdriver Roy

Post by **fsk658** » Sun Dec 27, 2009 3:55 pm

If you look at this web page www,sahillman.org.au/TT_smithsclock look at Technical tips. This gives details of how to change the polarity. It realy depends on how confident you feel to tackle this job. I have a smiths clock to fit into my moggy, which Is in need of repare the diode is open circuit and I am hoping to fit the transistors as the article explaines. Best of luck John